Electrode E7018-H4
Electrode E7018-H4
(OP)
I would like to know the difference of E7018-H4 to E7018. In our WPS it's mentioned the electrode classification to be used is E7018. Can we use E7018-H4 without amending or changing the WPS?
Thanks.
Thanks.





RE: Electrode E7018-H4
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"HZ -- Designates an electrode, an electrode/rod, or an electrode/flux combination that will meet an average diffusible hydrogen level Z when tested in accordance with ANSI/AWS A4.3, Standard Methods for Determination of the Diffusible Hydrogen Content of Martensitic, Bainitic and Ferritic Steel Weld Metal Produced by Arc Welding. The Z designator is usually limited to 16, 8 or 4 maximum average diffusible hydrogen in mL(H2) per 100 g of deposited weld metal. Other Z designators , such as 2, may be added for some classification systems, where appropriate. Examples: E7018H4, E7018H4R, E7018-1H4R, E71T-12H8, E8018-B2H8, F8A2-EW-WH8 and ER70S-3H4."
http://www.aws.org/wj/feb/wjarticle.html
S
Corrosion Prevention & Corrosion Control
RE: Electrode E7018-H4
Yes. This is a low hydrogen electrode where the maximum hydrogen content is specified by the supplier. This is not an essential variable change for your WPS.
RE: Electrode E7018-H4
RE: Electrode E7018-H4